*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.box{
    width: 600px;
    height: 400px;
    margin: 200px auto;
    overflow: hidden;
    position: relative;
}
ul{
    width: 600px;
    height: 400px;
    display: flex;
    position: absolute;
    transition: 0.5s;
}
ul li{
    width: 600px;
    height: 400px;
    list-style: none;
}
ul li img{
    width: 600px;
    height: 400px;
}
.box span{
    display: none;
    position: absolute;
    font-size: 40px;
    top: 50%;
    margin-top: -20px;
}
.lbut{
    
    left: 10px;
}
.rbut{
    right: 10px;
}
ol{
    position: absolute;
    bottom: 10px;
    display: flex;
    left: 50%;
    margin-left: -45px;
}
ol li{
    list-style: none;
    background-color: white;
    margin-right: 10px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
}